This standard applies to the wall using a variety of small hollow blocks made of concrete brick machine, the main specifications of size 390mm × 190mm × 190 Ë‰ 140mm (length × width × height), empty heart rate no less than 25% .
This standard test items, including size and appearance, compressive strength, flexural strength, material density, bulk density block, empty heart rate, water content and water absorption, drying shrinkage, softening coefficient, anti- carbonation, freeze and permeability and so on.
The performance test specimen used in the project should be qualified for the size and appearance of the block.
the name of each part of block shown in Figure 1.
2. Size and appearance
steel ruler or steel tape: accurate to millimeters.
steel rule or a wooden ruler: longer than 400mm, the non-straightness in full within no more than 1mm.
length of the article surface in the middle of the top surface in the middle of the width, height measurement on both sides of the top. Each of the corresponding sides of the measuring time, accurate to the millimeter.
wall, rib thickness measured in the smallest area, select the top two of each measured each time, accurate to the millimeter.
Bending Measurement: The ruler affixed to sit pulp by hand, paddle surface and Pasta shop, measuring ruler and the corresponding surfaces of the specimen distance, accurate to the millimeter.
missing edge off with a check: the paste by edge ruler, measure the maximum distance between ruler and defects in the length, width, height direction of the projection of three dimensions, accurate to the millimeter.
crack inspection: steel ruler measurement with the largest crack in the surface where the projection size, accurate to the millimeter. If the crack extends from one side to another side, then the total extension of the projection of its size .
Measurement results: sample size of measurements should we deal with each successive record, bending, lack of edge off angle and the maximum crack length measurements were recorded.
3. Compressive strength
Material Testing Machine.
plate: thickness not less than 10mm, flat size should be larger than 440mm × 240mm. Be flat steel side, accuracy to within the long roughness is not greater than 0. lmm.
Glass plate: thickness of not less than 6mm, flat size and the requirements of the same plate.
The number of specimens of five blocks.
Dealing with the specimen surface and shop sit pulp slurry surface, so as the plane parallel to each other. Will put a solid steel base, flat face, and with the level raised to the level of foot. In a thin coating of steel on the first layer of oil, or laying a wet paper, then a layer with a weight of 325 or more copies of cement and 2 sand, adding the right amount of water transferred into the mortar, the specimens sitting or laying pulp slurry surface pressure were smooth mortar surface layer, so that even as mortar layer thickness of 3-5mm. Excess mortar scraped along the edge of specimen, standing 24 hours later, then the above approach to the other side of the specimen. To enable one or both sides can be parallel to each other in dealing with the second side, the foot should be placed in the level of the first surface has been raised to level up.
To reduce the time, but also in the first mortar layer disposed of, without standing, once in the upward surface layer of mortar, oil pressure on the pre-coated glass plate, blank edge mortar observation , will exclude all air bubbles, and adjusted to the level of the horizontal ruler until the mortar layer flat and uniform, thickness 3-5mm.
the sample surface with cement mortar, when mixed with appropriate amount needed plaster. Plasma treatment can also be skilled plaster surface.
Standard 2.2.1 in accordance with the method of measurement for each specimen length and width, respectively, the average calculated in all directions, and then calculate the level of each sample value of gross area, accurate to 1cm .
The test specimen placed in the machine, so that the axis of the specimen plate and the center of pressure testing machine overlap to second 1-2kgf/cm the speed of loading up to specimen damage. Read out the failure load P.
If the test machine compression plate enough to cover the specimen surface, in the specimen, the lower pressure side addition of auxiliary steel plate. Pull the steel pressure assisted
Test results and reports from the moment when water after 2 hours to read out the glass tube in the height of the water drop, the results of the three specimens should be reported separately.
Surface finish with the test block machine should be the original plate with a thickness of at least pull the original pressure side to assist the most far corner of steel plate from third.